Class Coverage

java.lang.Object
uk.ac.starlink.ttools.func.Coverage

public class Coverage extends Object
Functions related to coverage and footprints.

One coverage standard is Multi-Order Coverage maps, described at http://www.ivoa.net/Documents/MOC/. MOC positions are always defined in ICRS equatorial coordinates.

MOC locations may be given as either the filename or the URL of a MOC FITS file. Alternatively, they may be the identifier of a VizieR table, for instance "V/139/sdss9" (SDSS DR9). A list of all the MOCs available from VizieR can currently be found at http://alasky.u-strasbg.fr/footprints/tables/vizier/. You can search for VizieR table identifiers from the VizieR web page (http://vizier.u-strasbg.fr/); note you must use the table identifier (like "V/139/sdss9") and not the catalogue identifier (like "V/139").

Since:
29 May 2012
Author:
Mark Taylor
  • Method Summary

    Modifier and Type
    Method
    Description
    static boolean
    inMoc(String mocLocation, double ra, double dec)
    Indicates whether a given sky position falls strictly within a given MOC (Multi-Order Coverage map).
    static boolean
    nearMoc(String mocLocation, double ra, double dec, double distanceDeg)
    Indicates whether a given sky position either falls within, or is within a certain distance of the edge of, a given MOC (Multi-Order Coverage map).

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Method Details

    • inMoc

      public static boolean inMoc(String mocLocation, double ra, double dec)
      Indicates whether a given sky position falls strictly within a given MOC (Multi-Order Coverage map). If the given mocLocation value does not represent a MOC (for instance no file exists or the file is not in MOC format) a warning will be issued the first time it's referenced, and the result will be false.
      Parameters:
      mocLocation - location of a FITS MOC file: a filename, a URL, or a VizieR table name
      ra - ICRS right ascension in degrees
      dec - ICRS declination in degrees
      Returns:
      true iff the given position falls within the given MOC
    • nearMoc

      public static boolean nearMoc(String mocLocation, double ra, double dec, double distanceDeg)
      Indicates whether a given sky position either falls within, or is within a certain distance of the edge of, a given MOC (Multi-Order Coverage map). If the given mocLocation value does not represent a MOC (for instance no file exists or the file is not in MOC format) a warning will be issued the first time it's referenced, and the result will be false.
      Parameters:
      mocLocation - location of a FITS MOC file: a filename, a URL, or a VizieR table name
      ra - ICRS right ascension in degrees
      dec - ICRS declination in degrees
      distanceDeg - permitted distance from MOC boundary in degrees
      Returns:
      true iff the given position is within distance degrees of the given MOC